Good post.
> Sticking to HTTP/2 pretty much allows you to go back and use the long-polling tricks of the past before websockets was created.
Interesting how things turned out. The old bad way is now a good way. Last time I've checked Google Hangouts also used polling instead of WebSockets.
[1] https://daniel.haxx.se/blog/2016/06/15/no-websockets-over-ht...